It ____ heavily yesterday morning when I woke up.

It ____ heavily yesterday morning when I woke up.
A rains
B rained
C is raining
D was raining
Where did you go this morning?
I _____ my homework in the reading room the whole morning.
A did
B have done
C is doing
D was doing
It was already nine o'clock _____ she got to school.
A while
B when
C it
D because
They were dancing ____ the music was playing.
A while
B when
C if
D because
I looked after his brother while he ____ here.
A left
B came
C was leaving
D was away from